shapesturbating 

The act of masturbating in a crowded room (usually 4-6 people) without their knowledge, and then proceeding to dive your semen soaked hand into a pack of shapes. Afterwards, you can either wash your hands or lick the now flavor packed semen off of your fingers

Ben: Dude, did you hear what happened in Cabin 9 last night?
John: No what happened?
Ben: Apparently Xavier was shapesturbating
John: That's disgusting

shapesturbating by Jernandez December 3, 2016

shukesturbating 

Simultaneously vomiting and excreting feces while gratifying ones self through the act of masturbation.

1. Gary was extremely dehydrated after shukesturbating violently.
2. Common side effects of shukesturbating often include extreme fatigue, loss of appetite, and bloodfarts.

shukesturbating by gary612 July 7, 2010

Shatsturbating 

The act of pooping, whilst, simultaneously, masturbating. This act is best accomplished on a toilet, or toilet-esque surface.

"I ate a lot of beans, and then I shatsturbated!"

Larry: "Wow, Turner, what's that smell coming from the bathroom? It smells of quando and poopy."
Turner: "Don't blame a brothah for shatsturbating. It's natchrill."

Shatsturbating by Jason Brown Bear January 13, 2008

shassturbating 

The act of vigorously inserting your thumb into and out of your rectum while masturbating in the shower.

Chris blew his load everywhere when he was shassturbating this morning.

shassturbating by Mytinylittlehand May 7, 2017